Perimeter

Industry leading security services specialized in fuzzing, securing DeFi's largest protocols

[Perimeter @perimeter_sec]

We’re excited to welcome Josselin to Perimeter as Lead Fuzzing Specialist!

Ex-Engineering Director of the blockchain team at Trail of Bits. Author of Slither.

🧵 highlighting some of his achievements

[Perimeter @perimeter_sec]

The round has less than 4 days left. If these matter to you, contributions have outsized impact. Appreciate the teams behind all of them!

[Perimeter @perimeter_sec]

We are donating $100 to each of these public goods on @Giveth QF Round 16.

Most of them are tools we actually use in our fuzzing work. The rest are important for the ecosystem we operate in. All open source, zero revenue.

Going one by one 👇

[Perimeter @perimeter_sec]

SEAL 911.

Hopefully you never need them but if you do, they are there 24/7, doing the invisible work saving millions.
https://t.co/1lx7qjMHeq

[Perimeter @perimeter_sec]

@gbrigandi @Polkadot Polkadot public disclosure and postmortem https://t.co/TfYuZZKLoo

[Perimeter @perimeter_sec]

🛡️ $69 Million TVL Saved

Our very own @gbrigandi reported a critical vulnerability, saving $69,000,000 in TVL for @Polkadot.

We’re proud to strengthen the ecosystem through responsible disclosure and proactive security research.

Blog post coming soon!

PS: Found with fuzzing

[Perimeter @perimeter_sec]

More to come.

One particularly compelling piece of Gianluca’s work will be public soon.

[Perimeter @perimeter_sec]

Built the tools. Found the bugs.

We’re excited to welcome Gianluca Brigandi (@gbrigandi) to Perimeter as Tooling Specialist.

• Author of Traverse, Tameshi, and ThalIR
• Multiple confirmed bounties

[Perimeter @perimeter_sec]

No generic workflow. Codebase-specific tooling.

His approach:
• Custom tooling for each codebase
• Combine static analysis, fuzzing, compiler methods + more
• Fine-tuned to target the system

Result:
• Deep, novel bugs
• Confirmed bounties

[Perimeter @perimeter_sec]

Repo & changelog: https://t.co/EGckcLRBQT

[Perimeter @perimeter_sec]

fuzzlib v1.1.0 released – now with broader compatibility and new utilities for Solidity fuzzing

What's new:
- clampArr: Efficient array clamping
- scaleDec: Decimal scaling helper
- errAllow: Full support for pre-Cancun chains
- Updated cheatcodes to allow latest functionalities

[Josselin Feist @Montyly]

I received a lot of questions after the @perimeter_sec announcement

I am still providing my services as an individual to select clients, but I am also happy to work with teams that share the same values

Perimeter is a curated fuzzing group with a work-based model, similar to @spearbit, @zenith256 or @AdevarLabs

I joined because I believe invariant-driven development is a key step toward improving the industry's security maturity, and because they share the same focus on quality and mindset

If you are passionate about fuzzing, you should join their Discord (you can ping @rappie_eth for an invite)

[Josselin Feist @Montyly]

Looking forward to working with the Perimeter folks and continuing to push the state of fuzzing!

[Perimeter @perimeter_sec]

Get a quote now to uncover what audits miss and keep your protocol secure for today's launch and fortified for tomorrow's upgrades.

Hear back from us within 24 hours by either:
→ DM
→ Filling out this form https://t.co/E23ne3zzGj

[Perimeter @perimeter_sec]

We’re excited to welcome Josselin to Perimeter as Lead Fuzzing Specialist!

Ex-Engineering Director of the blockchain team at Trail of Bits. Author of Slither.

🧵 highlighting some of his achievements

[Perimeter @perimeter_sec]

What this means for Perimeter

Josselin fits perfectly with our vision of building robust foundations for protocols from inception and prevent issues from even being committed.

With deep expertise in tooling and security, we are eager to accelerate our mission with him on board!